www.spiegel.de

The numbers

First visit

0.484 g CO₂e

Return visit

0.083 g CO₂e

Hosting

verified green

LCP

304 ms

CLS

n/a

TTFB

32 ms

At 10,000 views a month this page emits about 46.1 kg CO₂e a year, roughly 189 km in an average petrol car. The estimate assumes 75% new and 25% returning visitors, a measured cache reload ratio of 17%, and world-average grid intensity. How we calculate this

1. Defer video and audiosave ~0.186 g/visit (1.94 MB)High impact · quick fix

   2.42 MB of audio/video downloads during initial page load; 1 video autoplays; 18 videos preload data without preload="none".

   Never autoload media: use preload="none" with a poster image, load players on interaction, and stream in an efficient codec (AV1/HEVC).

   • ss.widget.320.mp42.42 MB
   • ss.widget.mp40 B

   WSG 2.9: Optimize media to reduce resource use
2. Optimize web fontssave ~0.014 g/visit (143 kB)Medium impact · quick fix

   12 font files total 409 kB.

   Subset fonts to used glyphs, prefer one variable font over multiple weights, serve WOFF2 only, and consider system fonts for UI text.

   • SpiegelSerifTextUI-Regular.woff241 kB
   • SpiegelSans4UI-Bold.woff240 kB
   • FP5K91xuHSSpKilTg3tZgsXYyjWl1bsC6mdx9qSkYxYCK…40 kB
   • SpiegelSans4UI-Regular.woff239 kB
   • XbvfukaUw81aftKubuMpQmk4NjUSSd0jmFMtaT4u3s8GE…38 kB

   WSG 2.11: Use optimized web typography
3. Reduce JavaScript payloadsave ~0.013 g/visit (138 kB)Medium impact · moderate effort

   12 scripts total 554 kB on the wire (2.09 MB decoded). Bundles this size usually carry a lot of unused code.

   Split bundles per route, tree-shake dependencies, and audit with a bundle analyzer or coverage profile. A 25% cut is a conservative target for bundles this size.

   • launch-8a2e39fde471.min.js124 kB
   • Notice.97af9.js95 kB
   • iqadcontroller.js77 kB
   • c3650cdf-216a-4ba2-80b0-9d6c540b105e58d2670b-…62 kB
   • index.fa4e3342d1fdc67eee34.js57 kB

   WSG 3.2: Minify and remove unused codeWSG 3.3: Modularize bandwidth-heavy components
4. Audit third-party servicessave ~0.011 g/visit (118 kB)Medium impact · moderate effort

   2 third-party domains account for 236 kB (6% of the page).

   Remove services that no longer earn their place; load the rest on interaction (facades for embeds, delayed consent-gated tags). Each third party is also a privacy and performance dependency.

   • assets.adobedtm.com125 kB
   • 111 kB

   WSG 3.5: Treat third parties the same as first parties
5. Fix caching for returning visitorssave ~0.0052 g/visit (43 kB)Medium impact · quick fix

   On a repeat visit 173 kB of static assets were re-downloaded instead of coming from cache.

   Serve static assets with Cache-Control: public, max-age=31536000, immutable and versioned filenames so returning visitors download almost nothing.

   • c3650cdf-216a-4ba2-80b0-9d6c540b105e58d2670b-…Cache-Control: no-cache · 62 kB
   • FP5K91xuHSSpKilTg3tZgsXYyjWl1bsC6mdx9qSkYxYCK…no Cache-Control header · 40 kB
   • XbvfukaUw81aftKubuMpQmk4NjUSSd0jmFMtaT4u3s8GE…no Cache-Control header · 38 kB
   • zw33CphKpKVsayl6dSK296z8AZM5Nm9no Cache-Control header · 33 kB
   • 203692e46-5d334-4157-cee1-0cd05f384080_w910h_…Cache-Control: max-age=0, max-stale=0, must-revalidate, no-cache, no-store, no-transform, post-check=0, pre-check=0, private · 312 B

   WSG 4.2: Optimize caching and support offline access
6. Upgrade compression beyond gzipsave ~0.014 g/visit (145 kB)Advisory · quick fix

   969 kB of text ships gzip-compressed; Brotli or Zstandard would cut roughly another 15-20%, and browsers without them fall back to gzip automatically.

   Serve precompressed Brotli for static text assets (highest level, compressed at build time) and enable Brotli or zstd for dynamic responses; keep gzip only as the fallback.

   • messages259 kB
   • spiegel.de249 kB
   • launch-8a2e39fde471.min.js124 kB
   • Notice.97af9.js95 kB
   • iqadcontroller.js77 kB

   WSG 4.3: Reduce data transfer with compression
7. Set a page-weight budgetAdvisory · moderate effort

   At 4.00 MB per view this page rates F. The findings above list where the weight is.

   Agree a transfer budget (e.g. under 975 kB reaches a B), enforce it in CI, and re-scan after each change to hold the line.

   WSG 3.1: Set goals based on performance and energy impact
8. Remove the entry redirectAdvisory · quick fix

   The address that was scanned goes through 1 redirect before the document is served, ending at https://www.spiegel.de/. Every hop is a full round trip on a connection that has not warmed up yet.

   Point links, sitemaps and canonical tags at the final address, and make the host redirect in one hop rather than chaining http to https to www.

   • https://spiegel.de/redirects to https://www.spiegel.de/

   WSG 4.4: Setup necessary error pages and redirection links
9. Simplify the document structureAdvisory · larger effort

   The page renders 8389 DOM elements, above the 1,500 guideline. Large trees cost memory and CPU on every visitor's device.

   Flatten wrapper markup, render long lists virtually or paginate, and prefer semantic elements over nested divs.

   WSG 3.6: Ensure code follows good semantic practices

Where the bytes are

• Audio / video2.42 MB · 2 req
• JavaScript554 kB · 12 req
• Fonts409 kB · 12 req
• Data (XHR)261 kB · 3 req
• HTML251 kB · 2 req
• Images73 kB · 31 req
• CSS28 kB · 2 req
• Data (fetch)4.6 kB · 6 req